Добавил макросы

example3.php

@@ -0,0 +1,11 @@
+<?php
+
+$data = array('phedor', 'andrey');
+
+
+require_once 'klein.php';
+
+$tpl = new Klein();
+$tpl->compile('template3.html');
+
+echo $tpl->render(array('names' => $data));

klein.php

@@ -6,21 +6,26 @@ class Klein {
     function compile($html) {
         $pattern = array_map(function ($grammar) {
             list(, $result) = $grammar;
-            $body = strtr($grammar[0], [" " => "\s*", "+" => "\s+", ":var" => "(\w+(\s*\.\s*\w+)*)", ":id" => "(\w+)"]);
+            $body = strtr($grammar[0], [' ' => "\s*", '+' => "\s+", ':var'  => "(\w+(\s*\.\s*\w+)*)", ':id'   => "(\w+)"]);
             return ["/$body/",
                 function ($x) use ($result) {
-                    return "<?php " . preg_replace_callback("/#([\d\w]+)/", function ($s) use($x) {
-                        return preg_replace("/\.\s*(\w+)/", "['$1']", $x[$s[1]]);
+                    return "<?php " . preg_replace_callback("/#(\d+)(s?)/", function ($s) use($x) {
+                        $pref = $s[2] == 's' ? '$' : '';
+                        return implode(", ", array_map(function ($s) use($pref) { return $pref.preg_replace("/\.\s*(\w+)/", "['$1']", $s); }, preg_split("/\s*,\s*/", $x[$s[1]])));
                     }, $result) . " ?>";
                 }];
         }, [
-            ["{% for+:id+in+:var %}", "foreach(\$#2 as \$index => \$#1): \$loop = Klein::loop(\$index, \$#2);"],
-            ["{% for+:id , :id+in+:var %}", "foreach(\$#3 as \$#1 => \$#2):"],
+            ["{% for+:id+in+:var %}", "foreach(#2s as \$index => #1s): \$loop = Klein::loop(\$index, #2s);"],
+            ["{% for+:id , :id+in+:var %}", "foreach(#3s as #1s => #2s):"],
             ["{% endfor %}", "endforeach;"],
-            ["{% if+:var %}", "if(isset(\$#1) && \$#1 ):"],
+            ["{% if+:var %}", "if(isset(#1s) && #1s):"],
+            ["{% else %}", "else:"],
             ["{% endif %}", "endif;"],
-            ["{{ :var }}", "echo \$#1;"],
-            ["{{ :var\|:id }}", "echo #3(\$#1);"]
+            ["{{ :var }}", "echo #1s;"],
+            ["{{ :id\(( :var (, :var )*)?\) }}", "echo macro_#1(#2s);"],
+            ["{{ :var\|:id }}", "echo #3(#1s);"],
+            ["{% macro+:id\(( :id (, :id )*)?\) %}", "function macro_#1(#2s) {"],
+            ["{% endmacro %}", "}"]
         ]);
   
         $result = file_get_contents($html);

template3.html

@@ -0,0 +1,9 @@
+<div>
+{% macro hello(name) %}
+    <em>hello, {{ name }}<em>
+{% endmacro %}
+
+{% for name in names %}
+    {{ hello(name) }}
+{% endfor %}
+</div>